RE: As of kernel 4.4-rc1 segmentation fault if msr module not loaded. [REGRESSION][BISECTED]

From	"Doug Smythies" <dsmythies@telus.net>
Newsgroups	linux.kernel
Subject	RE: As of kernel 4.4-rc1 segmentation fault if msr module not loaded. [REGRESSION][BISECTED]
Date	2015-11-27 17:20 +0100
Message-ID	<qztUB-5dg-11@gated-at.bofh.it> (permalink)
References	<qz7AK-7Bz-7@gated-at.bofh.it> <qz99w-gG-11@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On 2015.11.26 10:10 Borislav Petkov wrote:
> On Thu, Nov 26, 2015 at 08:25:43AM -0800, Doug Smythies wrote:
>>
>> In some distros, the msr module is not loaded by default.
>> (I guess not built in by default, would be more correct.)
>> I often forget to load it before using "rdmsr" or "wrmsr".
>> It was never an issue before, but as of Kernel 4.4-rc1
>> it causes a segmentation fault crash. Example:
>> 
>> # rdmsr -a 0x19a
>> Segmentation fault (core dumped)

> You can either cherrypick
> http://git.kernel.org/tip/2d5be37d686c4dae8e60d20283d6f44ac2c44f65

Just for completeness:
I confirm that the above commit fixes the issue raised herein.
Thanks.

... Doug


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As of kernel 4.4-rc1 segmentation fault if msr module not loaded. [REGRESSION][BISECTED] "Doug Smythies" <dsmythies@telus.net> - 2015-11-26 17:30 +0100
  Re: As of kernel 4.4-rc1 segmentation fault if msr module not  loaded. [REGRESSION][BISECTED] Borislav Petkov <bp@alien8.de> - 2015-11-26 19:10 +0100
    RE: As of kernel 4.4-rc1 segmentation fault if msr module not loaded. [REGRESSION][BISECTED] "Doug Smythies" <dsmythies@telus.net> - 2015-11-27 17:20 +0100

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